package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.enume.OrderStatusEnum;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.service.WareSkuService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.SkuHasStockVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import lombok.Data;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;
    @Autowired
    ProductFeignService productFeignService;
    @Autowired
    RabbitTemplate rabbitTemplate;
    @Autowired
    WareOrderTaskService wareOrderTaskService;
    @Autowired
    WareOrderTaskDetailService wareOrderTaskDetailService;
    @Autowired
    OrderFeignService orderFeignService;


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        /**
         * skuId: 1
         * wareId: 2
         */
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if(!StringUtils.isEmpty(skuId)){
            queryWrapper.eq("sku_id",skuId);
        }

        String wareId = (String) params.get("wareId");
        if(!StringUtils.isEmpty(wareId)){
            queryWrapper.eq("ware_id",wareId);
        }


        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果还没有这个库存记录新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if(entities == null || entities.size() == 0){
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字，如果失败，整个事务无需回滚
            //1、自己catch异常
            //TODO 还可以用什么办法让异常出现以后不回滚？高级
            try {
                R info = productFeignService.info(skuId);
                Map<String,Object> data = (Map<String, Object>) info.get("skuInfo");

                if(info.getCode() == 0){
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            }catch (Exception e){

            }


            wareSkuDao.insert(skuEntity);
        }else{
            wareSkuDao.addStock(skuId,wareId,skuNum);
        }

    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        return skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count != null && count > 0);
            return vo;
        }).collect(Collectors.toList());
    }



    /**
     * 解锁方法
     * @param skuId
     * @param wareId
     * @param num
     * @param detailId
     */
    private void unLockStock(Long skuId, Long wareId, Integer num, Long detailId) {
        //库存解锁
        wareSkuDao.unLockStock(skuId,wareId,num);
        //更新工作单的状态
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(detailId);
        //已解锁
        entity.setLockStatus(2);
        wareOrderTaskDetailService.updateById(entity);
    }


    /**
     * 锁定订单库存
     * 库存解锁场景：
     *      1，下单成功，订单过期没有支付被系统自动取消，被用户手动取消，都要解锁库存
     * @param vo
     * @return
     */
    @Transactional
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情，方便问题追溯
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        wareOrderTaskService.save(taskEntity);

        //1,按照下单的收货地址，找到一个就近仓库，锁定库存
        //找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());

        //锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size()<=0){
                throw new NoStockException(skuId);
            }
            for (Long wareId : wareIds) {
                //锁定库存,成功返回：1，失败返回：0
                Long count = wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
                if (count == 1){
                    skuStocked = true;
                    /*告诉MQ库存锁定成功 */
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, null, hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    wareOrderTaskDetailService.save(entity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo detailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity, detailTo);
                    //存入库存详情信息，防止回滚以后找不到数据
                    lockedTo.setDetail(detailTo);
                    //向mq发送信息
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", lockedTo);

                    break;
                }else {
                    //当前仓库状态失败，重试下一个仓库

                }
            }
            if (!skuStocked){
                //当前商品所有仓库没锁住
                throw new NoStockException(skuId);
            }

        }
        //库存锁定成功
        return true;
    }



    /**
     * 库存自动解锁
     *  1，下单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚，之前锁定的库存就要自动解锁
     *  2，下单失败，锁定库存失败
     *
     *  只要解锁库存消息失败，一定要告诉服务解锁失败。
     * @param to
     */
    @Override
    public void unLockStock(StockLockedTo to) {
        //库存工作单id
        Long id = to.getId();
        StockDetailTo detail = to.getDetail();
        Long skuId = detail.getSkuId();
        Long detailId = detail.getId();
        /*
         *  解锁，1查询数据库关于这个订单的锁定库存信息，
         *       有：证明库存锁定成功了
         *          1，没有这订单： 必须解锁
         *          2，有这个订单：不是解锁库存。
         *              订单状态：已取消：解锁库存   没取消：不能解锁
         *       没有：库存锁定失败了，库存回滚了。这种情况无需解锁
         */
        WareOrderTaskDetailEntity byId = wareOrderTaskDetailService.getById(detailId);
        if (byId != null){
            //解锁
            WareOrderTaskEntity taskEntity = wareOrderTaskService.getById(to.getId());;
            //根据订单号查询订单状态
            String orderSn = taskEntity.getOrderSn();
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0){
                //订单数据返回成功
                OrderVo data = r.getData(new TypeReference<OrderVo>() {});
                if (data == null || data.getStatus() == OrderStatusEnum.CANCLED.getCode()){
                    //当前库存工作单详情，状态1已锁定但是未解锁才可以解锁
                    if (byId.getLockStatus() == 1){
                        //订单不存在，订单已经被取消了，才能解锁库存
                        unLockStock(detail.getSkuId(),detail.getWareId(),detail.getSkuNum(),detailId);
                    }
                }
            }else {
                throw new RuntimeException("远程服务失败");
            }

        }
    }

    /**
     * 订单解锁
     * 防止订单服务卡顿，导致订单状态消息一直改不了，库存消息优先到期，查订单状态新建状态，什么都不做就走了
     * 导致卡顿的订单，永远不能解锁库存
     * @param orderTo
     */
    @Transactional
    @Override
    public void unLockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查询最新库存状态，防止重新解锁库存
        WareOrderTaskEntity task = wareOrderTaskService.getOrderTaskByOrderSn(orderSn);
        //按照工作单找到所有没有解锁的库存，进行解锁
        //1-已锁定
        List<WareOrderTaskDetailEntity> entities = wareOrderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>().eq("task_id", task.getId()).eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(), entity.getWareId(), entity.getSkuNum(), entity.getId());
        }

    }


    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num;
        private List<Long> wareId;

    }

}
